subs compatibility with sympy

[rikardn]

The following snippet run with symengine instead of sympy gives an error because of the missing option simulteneous. Is this needed also in symengine?

    expression.subs(substitutions, simultaneous=True)

E   TypeError: subs() got an unexpected keyword argument 'simultaneous'

[rikardn]

Turns out that symengine does the simultaneous substitution by default and there doesn't seem to be any non-simultaneous option (I don't know when one would want that). One quick solution would be to allow the simultaneousoption, but ignore it.